SHEN Yue,HE Guo- qiu,TIAN Dan- dan, LIU Xiao- shan, L Shi- quan
School of Materials Science and Engineering, Tongji University, Shanghai Key Laboratory for R&D and Application of Metallic Functional Materials, Shanghai 201804, China
Abstract：Effects of different contact stress (50, 150, 250 MPa) on fretting fatigue of 35CrMoA were investigated, the study was at the same equivalent stress amplitude (400 MPa) under the diamond loading path. Cyclic hardening/softening exhibited that the higher of the contact stress, the more serious of the degree of cyclic softening was. The result of hysteresis loop indicated that the fretting fatigue damage of 35CrMoA was mainly caused by shear stress under the diamond loading path, the shear stress- strain cycle hysteresis loop areas became larger with increasing the contact stress. The SEM of fretting zone showed that when the value of contact stress was lower, the slip region in the fretting zone was wide, and the adhesive region was narrow, and vice versa.The macro fracture of fretting fatigue illustrated that the crack source was initiative at the fretting zone and the fatigue cracks in the initial phase were perpendicular to the sample surface.
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2015, Vol. 22 
